John g



(No Model.)

Jr G. GARLINBT.

PITEUMATIG4 TOOL.

10.498,742. PatentedMay 30, 189s.

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n: wams Pzvsns co.. Pumauwo.. wAsHmsToN D c JOHN G. CARLINET, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF SEVEN-TENTHS TO WILLIAM ONEILL, .I AMES IOLSTENCROFT, AND

WILLIAM H. SOLEY, OF SAME PLACE.

PN EU MATIC TOOL.

SPECIFICATION forming part 0f Letters Patent NO. 498,742, dated May 30, 1893.

Application filed November 30, 1892. Serial No. 453,622. (No model.)

To a/ZZ whom t may con/cern.-

Be it known that I, JOHN G. CARLINET, a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented certain Improvements in Pneumatic Tools, of which the following is a specification.

The object of my invention is to construct a pneumatic tool that will deliver double the number of blows usually struck by pneumatic hammers, my invention being an improvement upon the tool described and claimed in the application for patent filed by me on the 20th day of April, 1892, Serial No. 429,912.

In the accompanying drawings:-Figure 1, is a longitudinal sectional view of my improved pneumatic tool. sectional view on the line 1-2, Fig. 1. Fig. 3, is a View of a detail of the bushing, Fig. 1; and Fig. 4, is a view illustrating a modification of my invention.

A is the casing of the tool.

A is a cap secured to one end of the casing; the tool carrier A2 is mounted in the opposite end. The casing A is contracted at a and a', forming two internal anges. The head of the tool carrier A rests against the flange at a', as clearly shown in Fig. 1.

B is an internal sleeve or bushing in which the plungers slide, and this sleeve is confined between packing b resting against an internal iange at ct, and a flanged ring B' against which bears the cap A. Between the bushing B and the case A, is an annular passage or air space c, forming a communication between the air inlet pipe O and the space w in front of the plunger D. The flange b of the sleeve B is cut away as shown in Fig 3, to allow the passage of air from the tube O to the space c, and passages c are cut through the forward end of the sleeve, and form a communication between the space o and the space w.

The cap B has a series of openings c2 which form communications between the tube C, and and the space w back of the plungerE; thus air under pressure is admitted to both ends of the tool, so that the tendency of the plungers D and E is to move to a central position,

Fig. 2, is a transverse but when air is admitted to the central air space to2 between the two plungers, they are forced apart .owing to the fact that the area of the plungers acted upon by the air in the space to2 is greater than the area of the plunf gers acted upon byar in the spaces w or w. Air is admitted to the space w2 through the passage ein the extension E2 of the plunger E, the passage e and the passage e2, as clearly shown in Fig. 1, so that ywhen the plunger E nears the center line x, the passage e will be opened to receive air under pressure, as it will have passed the edge of the ring B; but the passage of air is controlled by a valveF slidingin the space c', and as this Valve is loose within the plunger, it has a tendency to remain in the position of rest while the plunger moves forward; consequently the valve F will cut olf the admission of air to the space to2 at the proper time. When4 the plunger is returned the same action takes place, and the air in the space 'to2 is not allowed to exhaust until the plunger nears the end of its stroke. It will be noticed that the interior of the cap A is an exhaust chamber, with which the passage e communicates when the plunger is in the position shown in Fig. 1, and this exhaust chamber communicates with the atmosphere through an opening a2.

I preferably form between the cap A- and the ring B', an annular passage C for the air under pressure, so that air can be admitted to the spaces fw, w at more than one point.

The plunger D has an extension d', which, when the plunger is in the position shown in Fig. 1, is in contact with the head of the tool carrier A2, this plunger striking the tool car.

rier in its forward movement when the plungers are separated. This extension D as well as the plunger, is tubular, and passing through the plunger and extension is the extension E of the plunger E, which, when the plungers are moved toward each other to the center line, strikes the head of theftool carrier A2 delivering its blow.

I preferably enlarge the extension at g, and also enlarge the openings in the plunger D, and mount within this opening a suitable gain the advantages described and claimed in g the above mentioned application, but the tool will deliver a greater number of blows using the same amount of air under pressure.

In Fig. 4, I have shown a hollow lplunger E, and adapted to slide within said hollow plunl ger is a plunger D, and in this instance only two air spaces are used, one on each side of the plunger D, the hollow plunger E acting as vavalve to open and close the communicat- Both ends of the casing coml ing passages.

municate with the atmosphere, and the passages are so formed in the plunger E, that they will exhaust the air from either side of the plunger D when the plunger E is moved, as 2 will be readily understood by referring to Fig. 4.

A buifer il is adapted to a passage t" in the rear end of the casing or cap.

This passage 2 communicates with the air pressure pipe C, i

so that the buffer il is at all times projected against the rear end of the plunger E, and

, lng an extension E passing through the plunger D, a rear extension E2 extending through actsas a cushion for said plunger.

I claim as my invention- 1. rlhe combination in a pneumatic tool, .the tool carrier, two striking plungers and valve formations whereby the motive fluid is caused to act reversely upon the plungers so as to effect the retraction of one of said plungers simultaneously with the advancement of the other, substantially as specified.

2. Thefcombination, in a pneumatic tool,of

to strike at the same point, alternately, air

inlet and exhaust ports controlling a passage y of air to the tool, said ports bein g so arranged,

that when one plunger is striking the other plunger is recovering, substantially as described. i

3. The combination of the casing, the forward plunger D, the rear plunger E, said plungerE having an extension passing through the forward plunger, air spaces w, w at the end of the casing, and a central air space lwg, passages communicating with said air space, the valve for governing the flow of air to the central passage wz, substantially as described.

4. The combination of the casing, the plungers D and E therein, air passages in said casing, an air passage in the plunger E, with a Valve carried by said plunger, but adapted to independently slide and regulate the iioW of air through the passage in the plunger E, substantially as described.

5. The combination of the casin g, the bushing B therein forming an air passage, plungers D and E adapted to slide in saidbushing, a passage e at the forward end of the bushing, ring B at the opposite end, passages therein, with a passage in the plunger E, substantially as described.

G. The combination in apneumatic tool, ot' the casing A, a bushing B therein, a packing b confined by said bushing, a anged ring B restingupon the bushing and confined by a cap Af, a plunger D adapted to the bushing and having a tubular extension D thereon passing through the packing, a plunger E havthe ring B, passage in the plunger E and its rear extension E2, with a port. e forming acommu nication alternately between the air space and exhaust space, with a valve adapted to open or close the said ports, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subseribin g Witnesses.

JOHN G. CARLINET.

Witnesses:

HENRY HoWsoN, JOSEPH I-I. KLEIN. 

